RE: Debugging in exception handlers

You have to enable hardware breakpoints for FLASH. Do this by inserting
the following into your config file which should run when you boot your
code from SDS:

# enable hardware breakpoints in FLASH area - comment these instructions
out when running from RAM.
mem -d *
mem 0x0-0x6ffff hwbrk

Add a few other commands to your config as follows:
set vectbase = 0x0
set vectaddr = 0x0
@ MSR = 0x00000042

Regards,
Allan


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of prashanth_feb9
Sent: Monday, October 24, 2005 1:19 AM
To: [email protected]
Subject: [MPC500] Debugging in exception handlers


Hi All,
      I am working on Phycore MPC565 board with single step debugger. In
the configuration file of single step the DER register value was
0x73e67c0f. Whenever an exception was generated the debugger used to
display popup messages. To avoid the popup i have reset the bits in the
DER register.

As an example, I have reset the system call exception bit in DER to
check that whenever the exception occurs it branches to the exception
handler (Address 0xC00)

But when I generate a system call exception using a sc instruction and
apply a breakpoint at 0xC00 it does not stop at the breakpoint (This
address is in the internal Flash). Please let me know why the breakpoint
is not activated at 0xC00 and debug the exception handler code.

Thanks and Regards,
Prashanth








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